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Today I will introduce a consumable used in repairing electronic products
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Solder mask ink
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As you can see now
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The green-colored paste-like object in this plastic tube is similar to paint
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We call it solder mask ink
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Maintenance staff often call it green oil
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In fact, green oil is not only green in the market
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There are also some other colors like black, blue, red, etc.
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Because the green color is the easiest to buy in the market
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So most of the maintenance staff use this green solder mask ink
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Why there are so many colors
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Because there are many colors of the surface of the circuit board we repair
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The motherboards of the iPhone series I'm holding are all dark brown, close to black
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Other models may have other colors
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Android may be red
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blue
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There is also this dark brown similar to iPhone
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If the requirements for the appearance of the surface are relatively high
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Then we can choose the same color as it
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So
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Almost no signs of repairs
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What circumstances do you need to use this solder mask material?
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Let's find out
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The middle of this motherboard has been smeared with green oil
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Why?
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Let's take a look
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Clean the green oil with PCB cleaner
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The chip in this area has been removed
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The original motherboard was dark brown
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All solder joints are dark brown around
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The middle area is exposed to the original color of copper
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So the exposed area and the four surrounding solder joints are easily shorted together
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Short circuit may occur when soldering
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In order to avoid the connection between the surrounding solder joints and this area of the exposed copper
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So we gotta apply solder mask ink to this area
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Next, I will demonstrate how to apply
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Open the green oil protection cover
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Dip a little green oil with tweezers
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This operation can be done under the microscope
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When applying green oil
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Apply in small quantities with a few times
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If the amount is not enough at one time, you can dip a little more
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Don't apply a lot at once
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When you apply too much, the green oil height will become very high
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When soldering the chip, it may come up from the bottom to the top of the chip
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This will lead to poor soldering of the pins of our chip
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After applying green oil
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We can use UV curing light
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To solidify it
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After curing
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This area can't be wiped off any more
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So much for solder mask ink.Thank you for watching
